Inada Naoki <songofaca...@gmail.com> added the comment:

I think LOAD_CONST None + RETURN_VALUE is added here. And it removed by 
optimize_cfg().

https://github.com/python/cpython/blob/793f55bde9b0299100c12ddb0e6949c6eb4d85e5/Python/compile.c#L7795-L7797

I don't know how easy to remove this unnecessary None.
But LOAD_COMMON_CONST idea can remove all None from co_consts.
https://github.com/iritkatriel/cpython/pull/27

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